[CI] Add Dockerfiles linter - hadolint

.github/docker/ubuntu-22.04.Dockerfile

@@ -1,4 +1,4 @@
-# Copyright (C) 2023 Intel Corporation
+# Copyright (C) 2023-2024 Intel Corporation
 # Part of the Unified-Runtime Project, under the Apache License v2.0 with LLVM Exceptions.
 # See LICENSE.TXT
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
@@ -51,20 +51,23 @@ RUN apt-get update \
 	${BASE_DEPS} \
 	${UR_DEPS} \
 	${MISC_DEPS} \
+ && rm -rf /var/lib/apt/lists/* \
  && apt-get clean all
 
-RUN pip3 install ${UR_PYTHON_DEPS}
+# pip package is pinned to a version, but it's probably improperly parsed here
+# hadolint ignore=DL3013
+RUN pip3 install --no-cache-dir ${UR_PYTHON_DEPS}
 
 # Install DPC++
-COPY install_dpcpp.sh install_dpcpp.sh
+COPY install_dpcpp.sh /opt/install_dpcpp.sh
 ENV DPCPP_PATH=/opt/dpcpp
-RUN ./install_dpcpp.sh
+RUN /opt/install_dpcpp.sh
 
 # Install libbacktrace
-COPY install_libbacktrace.sh install_libbacktrace.sh
-RUN ./install_libbacktrace.sh
+COPY install_libbacktrace.sh /opt/install_libbacktrace.sh
+RUN /opt/install_libbacktrace.sh
 
 # Add a new (non-root) 'user'
 ENV USER user
 ENV USERPASS pass
-RUN useradd -m $USER -g sudo -p `mkpasswd $USERPASS`
+RUN useradd -m "${USER}" -g sudo -p "$(mkpasswd ${USERPASS})"

.github/workflows/hadolint.yml

@@ -0,0 +1,34 @@
+# Runs linter for Docker files
+name: Hadolint
+
+on:
+  workflow_dispatch:
+  push:
+  pull_request:
+    paths:
+      - '.github/docker/*Dockerfile'
+      - '.github/workflows/hadolint.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  linux:
+    name: Hadolint
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Clone the git repo
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+      - name: Run Hadolint
+        uses: hadolint/hadolint-action@54c9adbab1582c2ef04b2016b760714a4bfde3cf # v3.1.0
+        with:
+          recursive: true
+          dockerfile:  ".github/docker/*Dockerfile"
+          # ignore pinning apt packages to versions
+          ignore: DL3008